Patent GB-472842-A (GB)
Title: Improvements in or relating to automatic machines for operating upon a marginal or edge portion of a shoe sole
IPC: A43D95/24
Filed: 1936-04-01
Abstract: 472,842. Automatic shoe - making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., BAGSHAW. C. M., and HARRINGTON, A. April 1, 1936, No. 9597. [Class 17 (i)] Relates to machines wherein the work, held by a jack, and a tool, are automatically given relative movement to transfer the point of operation of the tool around the sole, during which movement the presentation of the work and the tool to each other is automatically controlled in accordance with the shape of the sole. Means are provided to change the pressure between the tool and sole so that during one traverse a pressure shall be exerted different from that during another traverse, the change being made automatically during the operation of the machine. The tool is pressed against the sole by resilient means automatically so controlled that the pressure is independent of the shape of the sole, and the tool is brought from inoperative position into engagement with the sole by a manual movement assisted by a hydraulic piston and cylinder. The machine is of the general type described in Specification 14696/08, [Class 17], arranged to traverse the forepart of a shoe past an oscillatory edge-setting tool 1 to and fro three times, a waxing device 9 applying wax to the sole edge during the second traverse as described in Specification 456,364, [Group III], and the oscillatory movement of the tool being stopped during the last traverse, as described in Specification 246,213, [Class 17 (i)], so that the tool operates with a simple wiping or sleeking action. The starting handle 17 is pivoted at 19 to another lever 21 pivoted at 23 and having a stud 25 co-operating with a slot 27 in the handle, a spring 31 threaded over a pin secured to the stud allowing yield. As described in the prior Specifications, the handle is swung anticlockwise to bring the tool up to the work and start the machine, the handle being locked in its left-hand position until the cycle is completed, when it is released. The lever 21 has a bifurcated lug, each part of which carries a pin 35 engaging a slot in one of a pair of links 39 pivoted to a piston 41 in a cylinder 43. Also pivoted to the piston is a rod 45 passing through a bore in a block 47 and carrying a collar 51 between which and the block is a strong spring 53. The block 47 is pivoted to a lever 13 which moves the tool up to or away from its work as described in the prior Specifications. A spring 44 urges the lever 21 to the left. As the handle is swung to the left the resistance of the work causes relative motion between the handle and the lever 21, this relative motion causing a bar 57 pivoted to the lower end of the handle, below its pivot, to move to the right. This rod slides in a guide in a bar 59 itself sliding in a block 71 arranged between fixed lugs 69. The bar 57 is shaped with an incline 83 leading to a flat 85, these co-operating with a plunger 73 actuating a valve admitting oil to the cylinder 43. A spring 65 urges the bar 59 to the right to abut against a stop 67 on the rod 57, and a stop 88 on the bar 59 prevents this moving through the block 71. The bar 59 has an inclined portion 87 co-operating with an arm 81 of a bell-crank lever linked to a bell-crank lever 105 provided with a pair of adjusting screws 113, 115 engaging a block 93 linked to the collar 51 and having an inclined surface slidably connected to an inclined surface on a block 91 secured to the block 47. The screw 115 normally enters a recess 117 in the block 93 which recess has an incline leading to the surface engaged by the screw 113. The purpose of this mechanism is to maintain a constant pressure of the tool on the work, a definite pressure corresponding to a definite length of the spring 53. In the position shown, the spring is not compressed. In the first traverse the screw 115 slides up on to the main surface and maintains the pressure constant, a variation in the length of the spring causing an axial movement of the screw which produces a movement of the valve plunger 73 to increase or decrease the pressure in the cylinder 43 to bring the spring back to its original length. The pressure can be varied by adjustment of the screw. To produce a lower pressure for the last traverse, after the wax has been applied, mechanism is provided for moving the bar 59 endwise so that the incline 87 interposes a smaller thickness between the plunger 73 and the arm 81, and thus allows the valve partially to close. The smaller flow of oil allows the spring 53 to expand, and the screw 115 remains in the recess, the balance of pressure being maintained by the screw 113 at a lower level than that maintained by the screw 115. To move the bar 59 endwise, a step 121 thereon is engaged by a tooth 123 on a link 125 actuated by an arm 135 secured to a rock-shaft 143 actuated by the extension 141 of a lever 139 which has a to-andfro movement imparted to it each time the direction of movement of the jack is reversed as described in the prior Specifications. An arm 147 is pivotally connected to a bar 151, these forming part of. the mechanism for stopping the oscillation of the tool described in Specification 246,213, the arm 147 rotating clockwise in successive steps. A pin 157 on the bar 151 engages a slot 155 in the link 153, a spring 161 urging the link downwards to a limit determined by an adjustable stop 159, preferably set so that at the second reversal of the jack the tooth 123 is low enough to engage the step 121. A latch 127 retains the bar 59 in its left-hand position until the end of the cycle, when the starting handle is automatically released and the latch is freed by engagement with a fixed abutment 167, and the bars 57, 59 return to starting position. Preferably, the various adjustments are so made that during the first to-and-fro traverse the tool oscillates with a heavy pressure ; during the second traverse wax is applied and the tool still oscillates, but is urged against the work by a lower pressure ; during the last traverse the oscillation is stopped, and the tool sleeks or wipes the work under the lower pressure. Specifications 22503/09, [Class 17 (i)], and 408,940 also are referred to.